We dive into Apple's new iTunes 9 multimedia store and music library app, and introduce you to Symantec's two Norton security apps for 2010.

Welcome to this week's special edition of the Download.com newsletter. There have been some new developments in the world of Windows software that we wanted to share, starting with the arrival of iTunes 9 (for Windows and Mac).

Apple released iTunes 9 on Wednesday (that's version 9 on 9/9/09--oh, the symmetry) at a special music-themed event in San Francisco. On top of enhancements like some new navigation tabs, Apple has expanded the content that can be distributed through iTunes, including bonus content packages you get when you buy movies or whole music albums. iTunes 9 also offers a new feature called Home Sharing, which allows you to share the songs you buy across authorized computers on a home network. The gist is that you can drag songs from one library to another, and even automatically sync newly purchased songs across the computers.

In addition to all this, Apple has also made improvements for iPhone and iPod Touch owners, both within the iTunes 9 desktop application and on the devices themselves, with an update to the iPhone operating system. Read more on these enhancements to the iPhone 3.1 OS, and find further details about iTunes 9 in our First Take write-up.

In other news, since we last wrote about security, a new player has sauntered into the field of updated security suites for 2010. Symantec's two premium Norton apps--Norton Internet Security 2010 and the lighter Norton Antivirus 2010--approach potential malware intrusions from a different angle. We've got the deeper story on Symantec's two Norton security offerings here. If it's more standalone security applications and security suites you're after, check out our security category on Download.com and our Security Starter Kit.

Jessica Dolcourt reviews smartphones and cell phones, covers handset news, and pens the monthly column Smartphones Unlocked. A senior editor, she started at CNET in 2006 and spent four years reviewing mobile and desktop software before taking on devices.